The study from French Polynesia comes as the WHO publishes related guidance.
Researchers put the overall GBS risk at 2.4 for every 10,000 people infected with Zika virus.
The goal is to flesh out a public health research agenda on Zika issues.
As cases of the mosquito-borne disease mount, the CDC urges pregnant women to skip going to the Summer Olympics in Brazil.
The CDC details 6 sexual transmission cases, some in pregnant women.
Also, WHO guidance today addresses breastfeeding, microcephaly, and Guillain-Barre syndrome.
WHO and PAHO leaders continue assessing Brazil's response to its Zika outbreak.
The findings underscore advice regarding strict precautions in returning travelers, the CDC says.
Also, a microcephaly study launches in Brazil and new mosquito control efforts are being explored.
The WHO said though Zika virus has circulated in Africa before, the effect of an importation from the Americas is unclear.
